cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A303406 Number of nX3 0..1 arrays with every element equal to 1, 2, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 7
3 28
4 119
5 541
6 2327
7 10384
8 47491
9 208616
10 938105
11 4229023
12 18855226
13 84609455
14 379973132
15 1700940358
16 7627893865
17 34215621269
18 153337948168
19 687522535009
20 3082887354405
21 13820286385598
22 61963243406462
23 277818915171978

List of values

[1, 7, 28, 119, 541, 2327, 10384, 47491, 208616, 938105, 4229023, 18855226, 84609455, 379973132, 1700940358, 7627893865, 34215621269, 153337948168, 687522535009, 3082887354405, 13820286385598, 61963243406462, 277818915171978]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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